Direct Observation of Short-Time Welding in UHMWPE Powders via X-ray Photon Correlation Spectroscopy and Magnetic Hyperthermia-Induced Sintering.

IF 5.1 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2025-07-18 DOI:10.1021/acsmacrolett.5c00388

Mathieu Salse,Guilhem P Baeza,Angelo Pommella,William Chèvremont,Victor Trillaud,Olivier Lame

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Abstract

We aim to elucidate the time scale over which welding between ultrahigh molecular weight polyethylene (UHMWPE) grains occurs by monitoring the dynamics of iron nanoparticles located at their interfaces, using X-ray photon correlation spectroscopy (XPCS). Within just one min above the melting point, we observe abnormally fast nanoparticle dynamics that emphasize the rapidity of the sintering mechanism, being key for the processing of long-chains polymers, as compared to the much slower chains re-entanglement shown by Yang et al. (Macromolecules, 2024, 57 (18), 8779-8792), resulting in UHMWPE thermodynamic equilibrium. The XPCS results are corroborated by in situ SEM imaging and supported by a theoretical model describing pore resorption, together offering a comprehensive view of early stage dynamics in weakly entangled polymers. To further validate our findings, experiments performed under conventional conduction heating are replicated using induction heating, where iron nanoparticles serve as localized nanoheaters through "magnetic hyperthermia", yielding consistent conclusions.

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利用x射线光子相关光谱和磁热烧结直接观察超高分子量聚乙烯粉末的短时间焊接。

我们的目的是通过x射线光子相关光谱（XPCS）监测位于超高分子量聚乙烯（UHMWPE）颗粒界面的铁纳米颗粒的动力学，阐明其发生焊接的时间尺度。在熔点以上的一分钟内，我们观察到异常快速的纳米颗粒动力学，强调烧结机制的快速性，这是加工长链聚合物的关键，与Yang等人（Macromolecules, 2024, 57(18), 8779-8792）所显示的慢得多的链重新纠缠相比，导致超高分子量聚乙烯热力学平衡。XPCS的结果得到了原位SEM成像的证实，并得到了描述孔隙吸收的理论模型的支持，从而为弱纠缠聚合物的早期动力学提供了一个全面的视角。为了进一步验证我们的发现，在传统的传导加热下进行的实验被复制到感应加热中，其中铁纳米颗粒通过“磁热疗”作为局部纳米加热器，得出了一致的结论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Macro Letters 化学-

CiteScore

10.40

自引率

3.40%

发文量

209

审稿时长

1 months

期刊介绍： ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.